Mold jacket



June 14, 1949. F. L. MADRIGAL 2,473,160

MOLD JACKET vF11@ 1 Ju1y 14, 1944 2 sheets-sheet 1 June 1,4, 1949,

F. 1., MADRIGAL 2,473,160

uom JACKET Filed Ju1y,1,4, 1944 2 sheets-sheet 2 Z Z8 .L 2/

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I nventor +I? w" Ww v gatented June 4;'1949 UNITED STATES PATENT OFFICEMom JACKET Frank L. Madrigal, Tulsa, oma.

Application July 14, 1944, Serial No. 544,851

a claims. (c1. zza- 109) This invention relates to molds for makingmetal castings and especially for making steel castings and moreparticularly to mold jackets slipped over the mold during the pouring ofthe metal, and it has for its main object to provide removable clampingmeans which may be attached to the mold jacket or to the parts orelements of which it is made in those cases in which it is of advantageto hold the bottom board and the jacket firmly against each other.

It is a further object of the invention to provide jackets to whichclamping means may be removably attached without however providing anyprojecting or additional parts on the jacket or on the sections of whichthe jacket consists.

A further object of the 'invention consists in providing spring-pressedclamping means which are, however, protected against damage by themolten metal poured into the mold. The resilient pressure of the springwill avoid breakage and cope displacement such as frequently occurs whenweights are used for pressing the mold against the bottom boards ascustomary.

A further object of the invention consists in providing a removable lockconstruction for holding the bottom board which is easily mounted andremoved and provides an effective and re liable clamping means forholding the bottom board.

With these objects in view the invention consists of a jacket which maycomprise a number of circumferential sections applied against the moldand slightly tapering in accordance with the tapering shape of the mold,which jacket or jacket sections are provided with taperingy recesses.Into these recesses lock members may be inserted which are provided withspring pressed members resiliently pressing the bottom board against themold and with means for protecting the springs against contacts with themetal. In this way the disadvantages associated with the use of Weightsholding the mold pressed against the bottom board or those associatedwith the use of fxedly attached locking means are overcome and a simpleand eective construction is provided which will materially reducebreakage and copedisplacement and which will eliminate the necessity ofkeeping large stocks of jackets or jacket sections, thus removing one ofthe causes for high waste of material inherent in the methods as nowpracticed.

One modification of the invention is illustrated in the accompanyingdrawings, in which- Figure 1 shows an elevational view of the jacketaccording to the invention when placed on a mold glithdthe locks inposition for holding the bottom oar Figure 2 is a plan view of thejacket placed over the mold. I a

Figure 3 is an elevational cross-section through the jacket and the moldalong the line 3 3 of Figure 2.

Figure 4 shows a plan view partly in section of the lock when seated inthe jacket the section being taken along line 4-4 of Figure 1.

Figure 5 shows a perspective view of the base member or holder of thelock. As shown in the example illustrated in Figures 1 and 2, the moldI0 consists o f a drag I I and of a cope I2; the drag is resting on thebottom board or mold table I3. The sides of the mold are slightlytapering toward the top, as customary vwith molds used for metal andespecially for steel casting, the extent of the tapering (which 1saround 7 degrees) being somewhat exaggerated in the drawings.

In the top I4 of the mold the gate I5 and various small holes I6permitting the escape of the airand gases are provided as customary.

The mold is surrounded by the jacket Il according tothe presentinvention which ts-exactly over the mold and which consists of fourseparate sections I8 (Figures 1 and 2) united by bolts I9. The innersides of said sections are slightly tapering toward the top to fit thetapered parts of the mold. In the center of each section or at least inthe center of two sections tapering recesses 20 with undercut sideportions 20a are provided adapted to accommodate the base parts orholders 22 of the locking mechanism generally indicated at 2l.

The recesses 2B are tapering toward the bottom so that said lockingmeans 2| may be inserted from the upper end. Said locking means consistof a base plate or holder 22 (Figure 5) tapering toward the bottom andprovided with beveled side edges 23. The base plate is therefore ofwedge-like shape and Wedge-like cross-section. The beveled edges 23 aredovetailing with the undercut side portions 20a. They are holding thebase plate 22 rmly when slipped into the recesses 20.

Said base plates are moreover-provided with an enlarged head 24 and withtwo lugs 25 arranged one above the other and projecting from the baseplate outwardly. These lugs are pro vided with holes 26 which arealigned. Through them a locker bar 21 passes which at its upper end isprovided with a bolt on which a handle 28 maybe secured. The lower partof the locker the tongue or clamp Il which reaches under the 'mold tableor The protective sleeve 3| reaches down as far as possible and has aflaring end which is turned outwardly. It protects the spring againstcontact with molten metal which inevitably is spilled on the top of themold during the pouring of the metal and ilows down the sides.

The spring 30, as seen in Figuresv 1 and 3, presses the tongue of thelocker bar 21 upwardly and, therefore, presses the bottom board i3against the drag Il. y

It is, therefore, seen that the use of the jacket 2i mannercorresponding tothe taper of the-side walls of the mold, and withrecesses tapering towards the bottom, comprising removable lockingdevices adapted to be held within said recesses and provided with baseplates tapering towards the bottom. each device carrying a locker f bar,a tongue on said locker baifor engaging the bottom board of the mold, aspring for pressing said locker bar upwardly and a sleeve covering saidspring to protect it against spilled metal.

2. A mold jacket provided with a bottom board, said jacket comprisingsections having inner walls tapering towards the top, means for joiningadjacent sections near their lateral substantially vertical edges toform a closed frame, the outer wall of each section being provided witha recess, said recess having two substantially vertical walls facingeach other tapering towards the bottom,

according to the present invention presents many zo advantages.

As soon as the so-called setting out of the mold (removal of a snap askor the like) has been performed the jacket is slid downover the mold,

the locker bars are operated by turning the handle 25 vided for thispurpose in order to prevent the rising of the copes. This method,although very simple, has however its drawbacks as it frequently 35causes the copes to sag.and even causes breakage when carelesslypracticed. Moreover, it obstructs the view so that the pourer who has tostand at a certain distance has no clear view of the gate.

The use of the jacket proves to be especially of advantage in connectionwith the casting method utilizing blind heads where the breakage isgreatest.

The invention has been illustratedV by showing only one modication; butit is manifest that a number of details, combination of details andmechanisms may be modiiied without departing from the essence of theinvention.

What I claim is:

1. A clamping arrangement for use in connection with molds having aplurality of side walls tapering inwardly toward the top and having abottom board, and with a jacket consisting of sections joined at theiredges to form a closed frame like structure, said sections beingprovided with inner walls tapering toward the top in a a removableclamping and locking means for holding the bottom board, provided with aback plate fitting intothe above named recess so as to engage the twotapering side walls, and spring pressed means carried by said back platefor gripping and holding said bottom board and for pressing against theunderside of the mold jacket.

3. A mold jacket provided with a bottom board, said jacket comprisingsections, provided with means for joining them V'at the lateral verticaledges to form a closed frame, each section being further provided with arecess in its outer side wall, the lateral walls of the recess facingeach other being undercut and tapering towards the bottom, a removableclamping and locking means for holding the bottom board removablytowards the jacket, said clamping and'locking means including a baseplate with tapering inclined lateral walls, dovetailing with theundercut tapering recess walls, said base plate carrying a springpressed locker bar, provided with a projecting member at its end forvgripping and holding the said bottom plate.

FRANK L. MADRIGAL REFERENCES CITED The following references are ofrecord in the le of this patent:

UNITED STATES PATENTS

